Insulated flask



FIG. 1 is a front elevational view of an insulated flask showing my new design;

FIG. 2 is a right side elevational view thereof, the left side elevational view is a mirror image;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an insulated flask, as shown and described. 